Drill and chuck.



V. J. WAHLSTROM. DRILL AND GHUGK. AYPLIOATION rum) mum, 191.1.

Patented Dec.3,112.

llldl'ltllll to l d l ld% It? VERNER J. WAHLSTROM, F BROOKLYN, NEW.YORK, ASSIGNO JR 6F ONE-HALF T6 BERNI-IARD T. BURCHARDI, 9F BROOKLYN,NEW YORK.

BRILL AN 33 CHUCK.

Specification of Letters Patent.

ilatented men. a,

1'0 (1. whom it may concern:

Be it known that I, VnnNnn J. ,lVAHL- STROM, a citizen of the UnitedStates, residing at Brooklyn, county of Kings, and State scribed andthen specifically set forth in the.

of New York, have invented a new and useful Improvement in Drills andChucks, of which the following is a specification.

This invention relates to an improvement indrills and chucks, and it hasfor its main object the pr duction" of a semiautomatic chuck-in whichthe grippingjaws are automatically moved toward the axis of the chuckand are shaped to prevent the drill from falling out when doing no work.

Another object is the production of a de vice in which the jaws areshaped with their outer ends lying nearer the of the chuck than theopposite ends and the drill is provided with clai'up'eng faces equalingin number the number of jaws in the chuck,

said faces being nearer the axis of the drill at the outer end of thechuck than at the in.- ner end of the drill.

With these and other objects not specifically mentioned in View, theinvention consists in certain constructions and combinations which willbe hereinafter fully dc claims hereunto appended.

In the accompanying drawings, which form a part. of this specificationand in which like characters of reference indicate the same or likeparts, Figure 1 a sectional view of a device constructed in accordancewith the invention, Fig. 2 is a sectional view taken on the line 2-2 inFig. 1, and. Fig. 3 is a detail view of a modified 'form of jaw anddrill shank.

In carrying the invention into effect, there is provided a chuck body 1'into which is driven a. shank 2 adapted to support the chuck in drillpress or like machine. The device is further provided with a shell 3surrounding the body 1 and rotated by a spring l. The body 1 is providedwith three radial slots 5 in which are slidably mounted three jaws 3,.11. movement of these jaws toward the axis of the chuck is produced by aseries of floating wedges 'T to operating with cam faces 8 termedon theinner periphcryot the shell 3.

The structure so far described is substantially the same as thestructure shown and described in detail in my C()-])Oll(llll l'application No. 58%,799, filed October 1, 1910,

and reference is made thereto for a full detailed description. venting;a drill from falling;- out of the chuck when not working, the jaws areprovided with operating faces $5 the outer ends of which lie nearer theaxis of the chuck than the inner ends 7 or ends nearest the shank 2.

A drill is provided which has a shank 10 provided with clamping faces 11equaling in number the number of jaws in the chuck, and these clampingfaces lie nearer the axis of the drill, and consequently nearer the Forthe purpose of preaxis of the chuck, at the outer end of the chuckthanat the extreme end of the drill within the chuck. It will stood that bythis construction the engagement of the inclined jaws with the inclinedfaces of the drill will prevent the drill from falling out of the chuckwhen there is little or no clamping action of the jaws on the drillshank. Moreover, the flattened faces of the drill in contact with theflattened faces of the jaws assist in firmly holding the drill inposition under strain y lo the modified form of jaw and drill.

shown in Fig. '3, it will be noted that the operating face 12 of the jaw13 is convex while the clamping; face i the drill i5 is concave tocooperate with the face of the jaws.

Changes and variations may be made in the structure by means of whichthe invention is carried into effect. The invention, therefore, is notto be restricted to the pre cise details of the structure shown anddescribed.

\ihat is claimed is:

The combination with drill having a shank provided with a plurality oflong fiat undercut clamping faces, of a chuck body provided with acentral. aperture larger than and adapted to receive the drill shank andhaving a plurality'ot slots opening into the aperture, a plurality ofdriving jaws within the slots and having lonn' flat operating faces Iadapted for contact with. the clamping faces of the drill shank, andmeans cooperating with the jaws to simultaneously move them into andtoward the axis of the aperture to rigidly hold the drill centrallywithin but out of contact with the walls of the aperture.

2. The combination with drill having a shank providedwith a plurality oflong flat undercut clampingfaces, of a chuck body be readilyunderprovided with a central aperture larger than and adapted to receivethe drill shank and having a plurality of slots opening into theaperture, a plurality of driving jaws within the slots and having longflat operating faces adapted forcontact with the clamping faces of thedrill shank, and a shell rotatable on the chuck body and having aplurality of internal ,cam surfaces cooperating with the jaws throughthe rotation of the shell' to simultaneously move them into and towardthe axis of the aperture to rigidly hold-the drill centrally within butout-of contactwith 3. The'combination with a drill having a and adaptedto receive e drill shank and having a plurality of slots opening intothe I aperture, a plurality of driving aws within the slots and havinglong flat operating faces adapted for contact with the clamping facesofithe drill shank, and a spring actuated shell rotatable on the chuckbody and 25 having a plurality of internal cam surfaces cooperating withthe jaws through therota tion of the shell to simultaneously move theminto and toward the axis of the aper ture to rigidlyhold the drillcentrally within 30 but out of contact with the walls of the aperture.

In testimonywhereofll have signed name to this specification in thepresence of two subscribing Witnesses.

VERNER J. WAHLSTROM.

Witnesses: I FRANK H. VIoK, J r., SYDNEY I-. PRESCOTT.

